You have to appeciate the honesty. A recent exchange:
Me (finding Snookie sitting on the sofa, where Mommy put him to wait for me): So, why are you in trouble?
Snookie: Because I put my carrots into my cup of water.
Me: Why did you put your carrots into your cup?
Snookie: Because I didn't know Mommy was coming.
Me: (long pause) Yes, I understand you didn't think you would be caught. But WHY?
Snookie: I wanted to see what it would taste like.
Me: And what did it taste like?
Snookie: A wet carrot.
Me: (long pause) Don't do that any more.
Snookie: Okay. Do you want to see the picture I drew?
I've been telling my wife for years to not bother asking the boys WHY they do things. I should take my own advice.